Mechanism for finishing screw-threading dies.



PATEI'I'IBD MAR. 5, 1907.

' E. E. BECK.

MEGHANISM FOR FINISHING SCREW THRBADING DIES.

APPLICATION FILED SEPT.18.1905.

2 SHEETS-SHEET 1.

Ira/@7150 71' PATENTED MAR. 5, 1907.

E. E. BECK.

MECHANISM FOR FINISHING SCREW THREADING DIES.

APPLICATION FILED SEPT. 16. 1905.

2 SHEETS-SHEET 2.

r W v r \i M, 2 1 /,M

UNITED STATES PATENT ora ion.

' EDWARD E. BECK, OF GI IICAGO, ILLINOIS, ASSIGNOR TO THE NYE TOOL AND MACHINE WORKS, A CORPORATION OF ILLINOIS.

MECHANISM FOR FINISHING SCREW-THREADING DIES? Specification of Letters Patent.

Patented March 5,1907.

" .T'o'hlZ whom it may concern.-

Be it known that I, EDWARD E. BEoK, a Subject of the King of Denmark, and a resident of Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Mechanism f or Finishing Screw-Threading Dies, of which the following is a specification.

This invention relates to a mechanism for finishing or trimming the thread-forming portions of screw-cutting dies, and has for its object to provide a simple and efiicient structural formation and combination of parts whereby various operations can be performed 1n a ready and accurate manner upon the instanding cutting-teeth of a screw-cutting die-Sach, for instance, as removing more-or less of such instanding teeth, the tapering or relieving; such teeth rearwardly from their cutting edges, and analogous operations, all as will hereinafter more fully ap ear.

n-the accompanying drawings, Figure 1 is a (plan view of the present apparatus adapt- 2 5 e as an attachment to a vertical drillpress. Fig.2 is in part a side elevation and in part a vertical sectional elevation of the same on line a: :11, Fig. 1. Fig. 3 is an end elevation of the same. Figs. 4 and 5 are companion onlarged detail sections illustrating the rotary cutter-head in an inactive and in an active position, respectively, with relation to the die-holding parts of the mechanism. Fig. 6 is a detail vertical section of the rotary cutter-head employed in the tapering or backing ofi of the instan ding threads of a screwcutting die.

Similar numerals of reference indicate like parts in the several views.

Referring to the drawings, 1 is the bed or base plate of the mechanism, adapted for stationary attachment to the bed-plate of an upright drill or like metal-working machine.

2 is a carriage sliding longitudinally on the base-plate 1 and having its movements limited by adjustable stops 3, carried by said bed-plate.

4 is an operating-lever having its fulcrum on the base-plate 1 and a pivotal connection to carriage 2 and adapted to afford a ready means. for effecting a longitudinal adjustment of the carriage.

5 is a base-plate mounted upon the carriage 2 and provided with the work-carrying neck or arbor now to be described.

I 6 is an upwardly-projecting tubular neck or arbor on said base-plate and having its periphery formed with a screw-thread corresponding to the interior threading-teeth of the screw-cutting die to be 0 erated on, and the formation of the parts is such that by screwing the die upon said arbor said die will be securely and properly held dUl ing the finishing operation upon the teeth of the same, as hereinafter described.

The arbor 6 may form an integral part of from, as shown, and be fixedly secured in place by a drive fit between the parts, as the judgment of the constructor may direct.

7 is a lateral opening at one side of the tubular arbor 6'for the passage ofthe rotary cutter-head, hereinafter described, when the with said cutter-head.

S is a loose collar or sleeve surrounding the base of the arbor 6 and resting upon the upper face of the base-plate 5. Such sleeve is adapted to form an abutment against which rests the lower face of the screw-cutting die which is being operated on, and the arrangement is such that said collar can be readily removed and replaced by a collar of greater o less height to suit dies of different thickness.

9 is the rotary cutter-head, formed with a number of rows of circularly-arranged cutter-teeth 10 and provided with an attaching-shank 11 for attachment to the livespindle of a vertical drilling or like machine on which the present mechanism is used. The formation of the aforesaid rows of cutting-teeth 10 will be varied to suit the different uses to which the present invention is applied. In the use of the mechanism for trimming oil or relieving the instanding teeth of the die from the cutting edge to the I heel of said teeth with a view to provide clearance the rows of cutter-teeth of said rotion to the teeth of saiddie; as illustrated in Fig. 6, while with the mechanism used to remove each alternate threading-tooth from the die in finishing the type of pipe-threading dies application for Letters Patent, Serial No. 284,442, for improvement in screw-cutting tools, filed October 26, 1905, the rows of teeth of the rotary cutter-head will be spaced I apart a distance-canal to the distance beno I I 4 I the base-plate 5 or be made separate therework is brought into cutting engagement tary head will have a complementary forma- I00 which constitutes the subject-matter of my H 5 tween two teeth of the die and will have flat or like cutting edges equal to the width of the base of a threading-tooth of the die, as illustrated in Figs. 4 and 5.

12 is an axial guide-bore formed in the cutter-head 9 and adapted to have guiding engagement with a stationary guide post or spindle 13, fixedly attached to the main base 1 in axial alinement with the live-spindle of the drilling or like machine on which the present mechanism is used.

, In the preferred form of the present invention as illustrated in the drawings the base-plate 5 and the work-holding arbor 6, mounted thereon, will be mounted in a pivotal manner on the carriage 2, so that said arbor, with the work held thereon, can receivea tilting adjustment with relation to the axis of rotation'of the cutter-head 9 to bring the spirally-arranged teeth of the die which is to be operated on in parallel relation to the circularly-arranged cutterteeth 10 of said cutter-head in the before-mentioned operation of removing alternate teeth of such, screw-cutting die. Such adjustahility of the work-holding arbor also atfords a ready means whereby less than the parallel arrangement above mentioned can e obtained for use in the operation of tapering or relieving the die-teeth rearwardly from their cutting edges.

In the adjustable form of said mechanism shown in the drawings, 14 are rolls seated between the work base-plate 5 and carriage 2, midway the width of said parts, to constitute rockers upon which the base-plate 5 may be tilted to one side or the other. 15 are adjusting-screws arranged at opposite sides of the base-plate 5 with their shanks passing down through said base-plate and screwing into the carriage 2. With such arrangement the operator by unscrewing the screws at one side of the base-plate and screwing down the screws at the other side of said base-plate can impart any required degree of latera obliqueness to said work base-plate and the work mounted thereon.

In the practical operation of the mechanism the screw-cutting die to be operated upon is screwed upon the screw-threaded periphery of the arbor 6, after which said arbor is adjusted by means described to the desired oblique position. At the same time the work-holding arbor 6 is moved horizontally by the 0perating-lever 4 to bring the tubular bore of said arbor centrally beneath the rotary cutter-head 9, carried by the livespindle of a vertical drilling or like machine. The cutter-head is then moved down into the interior of the tubular arbor 6 into the proper plane desired, after which the operator imparts a longitudinal adjustment to the carriage 2 and work holding arbor 6, mounted thereon, through the instrumentality of the hand-lever 4, bringing the work into cutting engagement with the rotary cutter-head 9, the lateral opening 7 in the arbor 6 permitting the passage of the rotary cutter-head into such cutting engagement. \Vith a conclusion of the described cutting action the parts are backed away from the cutter-head into the first-described position and the screw-cutting die turned around and otherwise adjusted to bring succeeding thread-carrying blades into position to be operated upon in the manner above described.

\Vith the present invention a simple and eflective holding engagement of a screw-cutting die during the finshing operations upon the teeth thereof is attained in a rapid, convenient, and central manner, with an entire avoidance of the difiiculty and delay which results from a holding engagement with the marginal portions of the dies in ordinary work-holders and due to variations and irregularities in the marginal portions of the dies'.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a mechanism for finishing screwrcutting dies, an arbor formed with a threaded periphery for holding engagement with the interior thread of a screw-cutting die, with a tubular bore adapted to receive a rotary cutter-head, and with an opening in its side for an outward movement of the cutter-head relative to the arbor into cutting engagement with the teeth of the die. Y

2. In a mechanism for finishing screw-cutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with the interior thread of a screw-cutting die, with a tubular bore adapted to receive a rotary cutter-head, and with an opening in its side for an outward movement of the cutter-head relative to the arbor into cutting engagement with the teeth of the die, and means for'eiiecting a tilting adjustment of said arbor in relation to the axis of rotation of said cutter-head.

3. In a mechanism for finishing screwcutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with the interior thread of a screw-cutting die, with a tubular bore adapted to receive a rotary cutter-head, and with an opening in its side for an outward movement of the cutter-head relative to the arbor into cutting engagement with the teeth of the die, a carriage for said arbor, a stationary slideway for said carriage, means for imparting movement to said carriage, and means for effecting a tilting adjustment of the arbor upon said carriage.

4. In a mechanism for finishing screw-cutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with a screw-cutting die, with a tubular bore adapted to receive a rotary cutter-head, and with an opening in its side for an outward movement of the cutter-head into cutting engagement with the teeth of the die, a base-plate carrying said arbor, a carriage for said base-plate and arbor, a stationary slideway for said carriage, means for imparting movement to said carriage, and means for effecting a tilting adjustment of said base-plate and arbor upon the carriage, the same comprising rockers seated centrally between the base-plate and carriage and side screws connecting the base-plate and carriage together.

5. In a mechanism for finishing screw-cutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with a screw-cutting die, with a tubular bore adapted to receive a rotary cutter-head, and with an opening in its side for an outward movement of the cutter-head into cutting engagement with the teeth of the die, a carriage for said arbor, a stationary slideway for said carriage, means for imparting movement to said carriage, and a steadypin mounted on the slideway and adapted for engagement with the lower end of the rotary cutterhead.

6. In a mechanism for finishing screw-cutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with a screw-cutting die, with a tubular bore adapted to receive a rotary cutterhead, and with an opening in its side for an outward movement of the cutter-head into cutting engagement with the teeth of the die, and a removable collar surrounding the base of the arbor to form an abutment for the die operated on.

7. In a mechanism for finishing screw-cutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with a screw-cutting die, with a tubular bore adapted to receive a rotary cutter-head, and with an opening in its side for an outward movement of the cutter-head into cutting engagement with the teeth of the die, a carriage for said arbor, a stationary slideway for said carriage, a removable collar surrounding the base of the arbor to form an abutment for the die operated on, means for imparting movement to said carriage, and means for imparting a tilting adjustment of the arbor on said carriage.

.8. In a mechanism for finishing screw-cutting dies, the combination of an arbor formed with a threaded periphery for holding engagement with a screw-cutting die, with a tubular bore adapted to receive a rotary cutterhead, and with an opening in its side for an outward movement of the cutter-head into cutting engagement with the teeth of the die, a base-plate carrying said arbor, a removable collar surrounding the base of the arbor to form an abutment for the die operated on, a carriage for said base-plate and arbor, a stationary slideway for said carriage, means for imparting movement to said carriage and means for effecting a tilting adjustment of sa1d base and arbor upon the carriage, the same comprising rockers seated centrally between the base-plate and carriage and side screws connecting the base-plate and carriage together.

Signed at Chicago, Illinois, this 14th day of September, 1905.

EDWARD E. BECK.

'itnesses ROBERT BURNS, HARRY G. NYE. 

